Cutter-grinding machine.



J. E. GLEASON.

CUTTER GRINDING MACHINE.

APPLICATION FILED SEPT-15' HHS.

Pfitented Nov. 19, 1918.

6 SHEETS-SHEET 1.

Willi WITNESSES: r

' ATTORNEYS J. E. GLEASON.

cumn GRINDING MACHINE.

APPLICATION FILED SEPT- !5. l9l6.

Patented Nov. 19, 19185 6 SHEETS-SHEEI 2.

Z C a Wrmssgs: f INVENTOR Arm/rivers J. E. GLEASON.

CUTTER GRINDING MACHINE. APPLICATION FILED SEPT. 15. 1916.

Patented Nov. 19, 1918..

6 SHEETS-SHEET 3.

INVEIVTUR mlfflkasafl ATTORNEYS WITNESSES:

J. E. GLEASON. cumn GRINDING MACHINE. API5LICATION FILED SEPT. t5. 19l6.

7 1,285,124. Patented Nov. 19, 1918 6 SHEETS-SHEET 4.

WITNESSES: INVENTOI? Jmaslf fileaaaiz ATTORNEYS Patented Nov. 19, I9I&

6 SHEETS-SIIEEI 5.

win/8858.- f, IIVI/ENTOR W JimsEZeawlz I v v BY ATTORNEYS I I. E. GLEASON.

I CUTTER GRINDING MACHINE.

APPLICATION FILED SPT. 15. 1916.

1,285,124. I PatentedN0v. 19,1918..

e SHEETS-SHEEI a. 12

'IIIII'IIIIIII WITH/E8858. J INVE/klfgka By I (fly/M ATTORNEKS' the operatin JAMES E. GLEASON, OF ROCHESTER, NEW YORK, ASSIGNOR TO GLEA SON WORKS, OF

ROCHESTER, NEW YORK, A CORPORATION OF NEW- YORK.

Application filed September 15, 1916. Serial No. 120,238.

r all whom it concern.-

Be it known that I, JAMES E. GLEASON, of Rochester, in the county of- Monroe and State of New York, have invented certain new and useful Improvements in Cutter- Grinding Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, formm a part of this specification, and to-the reference characters marked thereon.

My invention has for its purpose to provide a cutter grinding apparatus designed more particularly with a view to finishing the surfaces of certain types of cutter blades, such for instance as are employed in the production of curved tooth gears formed on the arc of circles, spirals, roulettes or other selected curve. More particularly the invention is designed with a view to imparting a relieving motion to the grinding members so as to afiord the necessary clearance for the blade when in cutting engagement with a blank. An additional object of the improvement is to provide a mechanism.

upon which cutter blades of the character mentioned can be ground and finished accurately and expeditiously. To these and other ends the invention consists in certain improvements and combinations of parts all as will be hereinafter more full the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a plan view of an apparatus constructed in accordance with the invention in its preferred embodiment;

Fig. 2 is a diagrammatic view illustrating the relative positions, of the grinding members and cutter at the commencement of each grinding operation;

Fig. 3 is a similar view showing the relative positions of the same parts at the end of each grinding operation;

Fig. 4 is a side elevation of the cutter with surfaces of the grinding meming relation; perspective view of one of the may be ground upon the appabers 1n grin Fig. 5 is a blades that ratus;

Fig. 6 is a vertical sectional view taken centrally of the cutter;

Fig. 7 is a side elevation of the machine; Fig. 8 is a sectional Fig. 6;

described,

view on line 8f8 of Fig. 9 is a sectional view on line 9 of Fig. 6;

Fig. 10 is a view in elevation looking togard the left side of the parts shown in Fig. 11 is a sectional view on the line 11 -41 of Fig. 1; p

Fig. 12 is a sectional view on line 12"-12 of Fig. 11;

Fig. 13 is a sectional view on line 13-13 of Fig. 1; and

Fig. 14 is a vertical sectional view on line 1414 of Fig. 1.

Similar reference characters throughout the several views indicate the same parts. I

In the present embodiment, 1 designates the main frame provided with standards 2 forming a bearing for a spindleor cutter supportfi, the cutter being mounted upon the inner end of the latter and embodying ahead 4 and a series of blades 5. The spindle 3 carries at its outer end a worm gear 6 driven by a worm 7 which is mounted upon a shaft 8. The latter carries a gear -9 at one end, which engages a cooperating mma n mmr rmnt Patented Nov.19, 191s.

scribed constitutes a means for rotating the cutter continuously during the grinding operation, the cutter being turned so as to initially present the cutting edges of the blades to the grinding members, or in other words, the blades are moved in the same direction as-when they are in cutting operation upon a blank. The cutting portion of each blade, which is shown in detail, is curved from front to back one suitable arc, and is relieved upon its outer end and side walls to permit proper clearance as it travels through a tooth space, and in order to finish the surfaces referred to with the proper contour, a relieving motion is imparted to the grinding members during each grinding operation, that is to say, each grinding member is 'ven a movement bodily in the direction 0% the axis of the cutter support and toward the latter. To this end, the several grinding members which will be more fully described presently are mounted upon; a' main bed 15 that is slidable back and forth on the base by the mechanism now to be described. The bed 15 carries at one end a pin grinding element or projection 16 engaging a cam slot 17 in the cam disk 18. The latter is fixedly mounted u on an arbor 19 carrying a worm wheel 20 t at is driven by the worm 21 mounted upon the shaft 11 already referred to. it will be seen that from the gearing just described, the cam 18 is continuously rotated, and through the slot 17, imparts a reciprocatery movement to the main bed 15. The contour of the slot 17 is such, as appears in Fig. 1, as to impart a slow feeding-in movement of the bed, and a quick return, or in other words, the grinding members are given a relatively slOW relieving motion toward the back end of each cutting portion during the grinding operation and a quick return movement to bring the grinding members back to proper position for cooperation with the blades next presented. Three grinding members are preferably provided formed of emery, carborundum, or similar substance, one operating upon each side face of a cutting portion of a blade, and a third one upon the outer end of the blade. in the present.

arrangement, grinder A engages the inside face a of each cutting portion, grinder B engages the outside face Z) of each cutting portion, and grinder G is of hollow annular formation with its edge in engagement with the outer end 0 of a cutting portion. Each grinding member is mounted upon a spindle as illustrated by 18*, which carries at its opposite end a pulley 19 adapted to receive a belt for driving the grinding wheel. The

C and its spindle are journaled in bearings secured, upon a standard 20 carried by the main bed 15 and is adjustable toward and from the cutter for preliminary positioning by a threaded adjusting stem 21?. Each of the remaining grinding elements 15 mounted upon the bed for both lateral and angular adjustment with reference to the cutter, such adjustment bein obtained in the-following manner: Each grinding wheel spindle is mounted in bearings upon a standard 22, adjustable laterally upon a slide 2.3 through the instrumentality of an adjusting screw 24 carried by the standard and nut 25 fixed on slide 23. The slide 23 is adjustable in adirection at right angles to the screw 24, on a supplemental bed 26 and carries a toothed rack 27 engaged by a pinion 28, and by turning the latter the support. 23 may be moved back and iorth upon the supplemental bed 26. The pinion 28 is mounted on an arbor 29 carrying an operating handle 30 at its upper end. The handle 30 is pivoted at 31 to an ear 32 and is held at any desired position of adjustment by the projections 33. The supplemental bed 26 is pivoted upon the main bed 15 to swing about the axis 3%, and is adjusted by means oi a worm 35 having engagement with a rack 36. jThe bed 15 carries a toothed reel: 3''? engaging a pinion 38 upon a spindle,

through rotation nannies provided with a hand wheel 39 and when it is desired to adjust the bed manually away from the cutter, the pin 16 is removed and by turning the wheel 39 the bed and grindin%membcrs can be moved to any position.

y the several adjustments a ready described, each grinding member can be moved with relation to the main bed 17 until it is in the proper location relativcl y to the cutter head. Preferably, the grinding members are arranged in the angular relation shown, the grinding Wheel'C being located with its grinding edge parallel to the outer end of the blade to be ground, and grinding wheels A and B being located at angles corresponding to the angles of the outside and inside surfaces of the cutting portion of the blade. in operation, the several grinding members are rotated continuously and at the same time the bed 15 is moved back and forth in the direction of the axis of the cutter head, producing corresponding movement of the grinding members so that they are moved bodily toward the base of each blade during the cutting operation and while the blade is presented to the grinding memher with its cutting edge first. in other words, the movement of the grinding wheels bodily back andi'orth is so timed with reference to the rotation of the cutter head, that the grinding wheels are in their outer posi tions as they engage the outermost part of the blades and as the blade moves along of the cutter head, the grinding wheels are moved bodily through the longitudinal movement of the bed 15 at such a rate as to correspond to the angle of relief of each blade. This imparts a relieving motion to the grinding wheels which grinds the outer end and opposite sides of each blade accurately, and exactly according to the predetermined angle of relief. The three grinding members may be used simultaneously, or if desired, they can be operated one at a time to finish the sides and outer end of the blade one at a time, although this does not affect the principle of operation of the apparatus as the relative motion of the cutter head and bed 15, which imparts relieving motion to the, grinding element is the same, whether one or all of the grinders are in operation.

T claim as my invention:

1. A grinding machine including a cutter blade support, and aplurality of grinding members engaging the sides and outer end of the blade and having a relieving motion withreference to the path of the blade during the grinding operation.

2. A grinding machine including a rotary cutter blade support, a plurality of grinding ill members engaging an end and both sides of t port and toward the latter dursifig the grindacesof the mg operation to relieve said of its outblade with reference to the path ting edge.

A grinding machine including a rotatable cutter blade support, a reciprocatory tool support movable axially of the blade support and a rota grinding tool thereon, in combination wit a driving mechanism connection between it and the blade support for rotating the latter continuously, and independent connections between the mechanism and the tool support for reciproeating the latter a predetermined number of times during a single rotation of the blade support.

4. In a grinding machine the combination with a rotary work support and a driving mechanism; of a flame, a plurality of separate rotary grinding members adjustably mounted on said frame, connections between the driving mechanism andthe frame and work support for rotating the latter continuously and operating the frame and work support relatively axially of the latter at regular intervals.

5. In a grinding machine the combination with a rotary work support and a driving mechanism, of a reciprocatory frame movable axially of the arbor, connections be tween the driving mechanism, and the work driving it continuously, and ame for reciprocating the work support at an ort for rotatin bei een it and the i r the latter axially of regular intervals, and a plurality of rota grinding members pivotally mounted and separately adjustable upon the frame.

6. In a grinding machine the combination with the main e and arotary work support thereon, of a reciprocatoryframe, a pluralit of rotary grinding members mounte in frames pivoted on the reciprocatory frame their pivots, and driving mechanism connected to the work support and reciprocatory frame for continuously rotatin the work support and reciprocating the me and separately adjustable on axially of the work support at regular intervals. v

7. In a grinding machine the combination with the main frame, a rotary work support thereon and a reciprocatory frame guided on the main frame to move axially of the work support, of a plurality of rotary grinding members mounted in frames adjustable on the reciprocatory frame, a rotary shaft mounted in the main frame connected to the reciprocato frame to move it at regular intervals an connections between said shaft and the work support to rotate it continuously.

JAMES E. GLEASON, 

